U.S. patent number 10,260,616 [Application Number 15/197,920] was granted by the patent office on 2019-04-16 for extra-large excavator hydraulic pump drive gear box lubrication and noise attenuation device.
This patent grant is currently assigned to KOREA INSTITUTE OF MACHINERY & MATERIALS. The grantee listed for this patent is KOREA INSTITUTE OF MACHINERY & MATERIALS. Invention is credited to Tea Seok Kim, Yong-Bum Lee.
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United States Patent |
10,260,616 |
Lee , et al. |
April 16, 2019 |
Extra-large excavator hydraulic pump drive gear box lubrication and
noise attenuation device
Abstract
A device for lubrication and noise attenuation of a gear box
includes: a case housing where a lubricant is provided in the
bottom side thereof; a driving gear provided in the case housing
and rotating by a driving torque of an engine; first and second
driven gears engaged to lateral sides of the driving gear and
rotating; and a third driven gear engaged to an upper side of the
driving gear and rotating, wherein the case housing includes a
lubrication plate provided in an inclined manner from an upper side
of the first driven gear to one side of the third driven gear such
that the lubricant drawn up by rotation torque of the first driven
gear is churned to an inner surface of the lubrication plate and
then dropped at the upper side of the first driven gear and one
side of the third driven gear for lubrication.
Inventors: |
Lee; Yong-Bum (Daejeon,
KR), Kim; Tea Seok (Daejeon, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
KOREA INSTITUTE OF MACHINERY & MATERIALS |
Daejeon |
N/A |
KR |
|
|
Assignee: |
KOREA INSTITUTE OF MACHINERY &
MATERIALS (Daejeon, KR)
|
Family
ID: |
58498937 |
Appl.
No.: |
15/197,920 |
Filed: |
June 30, 2016 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20170102066 A1 |
Apr 13, 2017 |
|
Foreign Application Priority Data
|
|
|
|
|
Oct 13, 2015 [KR] |
|
|
10-2015-0142521 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F16H
57/0457 (20130101); F16H 57/0495 (20130101); F16H
57/0423 (20130101); F16H 1/22 (20130101) |
Current International
Class: |
F16H
57/00 (20120101); F16H 57/04 (20100101); F16H
61/00 (20060101); F16H 1/22 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
2012-167792 |
|
Sep 2012 |
|
JP |
|
2012-180897 |
|
Sep 2012 |
|
JP |
|
2015-034581 |
|
Feb 2015 |
|
JP |
|
10-1998-0054007 |
|
Sep 1998 |
|
KR |
|
10-2004-0040860 |
|
May 2004 |
|
KR |
|
10-2014-0088634 |
|
Jul 2014 |
|
KR |
|
2012-144035 |
|
Oct 2012 |
|
WO |
|
Primary Examiner: Cook; Jake
Attorney, Agent or Firm: Lex IP Meister, PLLC
Claims
What is claimed is:
1. A device for lubrication and noise attenuation of a gear box for
driving a hydraulic pressure pump of an extra-large sized
excavator, comprising: a case housing where a lubricant is provided
in a bottom side thereof; a driving gear provided in the case
housing and rotating by a driving torque of an engine; first and
second driven gears engaged to lateral sides of the driving gear
and rotating in the case housing; and a third driven gear engaged
to an upper side of the driving gear and rotating, wherein the case
housing comprises a lubrication plate provided in an inclined
manner from an upper side of the first driven gear to one side of
the third driven gear such that the lubricant drawn up by rotation
torque of the first driven gear is churned to an inner surface of
the lubrication plate and then dropped at the upper side of the
first driven gear and one side of the third driven gear for
lubrication, and further comprises an auxiliary lubrication plate
separately provided in an outer side of the third driven gear for
lubrication with the lubricant which is churned up along the inner
surface of the lubrication plate by the rotation torque of the
first and third driven gears, drawn up to an upper side of the
third driven gear, and then dropped to an upper surface of the
third driven gear.
2. The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator of claim 1, further comprising a round-shaped auxiliary
plate separately provided at an outer side of the second driven
gear.
3. The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator of claim 1, wherein the lubrication plate comprises a
flange portion formed by being bent at lateral sides thereof, and
the auxiliary lubrication plate comprises an auxiliary flange
portion formed by being bent at lateral sides thereof.
4. The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator of claim 3, wherein the lubrication plate is narrowed
toward an upper side from a lower side thereof.
5. The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator of claim 1, wherein an air path hole is provided for air
ventilation between the lubrication plate and the auxiliary
lubrication plate.
6. The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator of claim 2, wherein the auxiliary lubrication plate
includes a curved portion curved at a distance at the outer side of
the third driven gear and a straight-line shaped plate disposed at
an end of the curved portion of the auxiliary lubrication plate and
formed in the shape of a straight line such that the lubricant
promptly flows down therethrough, and wherein an end of the
straight-line shaped plate protrudes further toward the driving
gear than a connection bracket that is disposed between the end of
the straight-line shaped plate and an end of the auxiliary plate
and connects the auxiliary lubrication plate and the auxiliary
plate.
7. The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator of claim 2, comprising connection ribs provided in an
outer surface of the lubrication plate, an outer surface of the
auxiliary lubrication plate, and an outer surface of the auxiliary
plate to connect the lubrication plate, the auxiliary lubrication
plate, and the auxiliary plate to an inner surface of the case
housing.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority to and the benefit of Korean
Patent Application No. 10-2015-0142521 filed in the Korean
Intellectual Property Office on Oct. 13, 2015, the entire contents
of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a gear box for driving a hydraulic
pump provided in an extra-large sized excavator and the like.
(b) Description of the Related Art
In general, a plurality of gears are arranged in a transmission,
such as an accelerator, a decelerator, and the like, provided in
various driving devices such as a vehicle, a generator, and the
like to transmit driving force input through an input shaft to an
output shaft by increasing/decreasing the driving force, and the
transmission is typically referred to as a gear box.
Prior to actual use of such a gear box, the gear box should satisfy
a performance test according to a number of requirements, that is,
durability and precise torque transmission characteristics of the
gear box.
In particular, large-scaled equipment such as an extra-large sized
excavator generates loud noise when driving a hydraulic pressure
pump mounted to the gear box, and accordingly, a means for reducing
the noise is required.
A configuration of a conventional gear box mounted to large-scaled
equipment such as an extra-large sized excavator is as follows.
In general, in an extra-large sized excavator (e.g., with a vehicle
body weight of greater than 90 tons), three or more hydraulic
pressure pumps are provided per single engine driving shaft to
operate a hydraulic system, thereby reducing fuel consumption.
Such a gear body of the extra-large sixed excavator is provided
with a plurality of gears formed of driving gears and driven gears
in an outer case. In addition, when the gears are partially rotated
with a predetermined depth from an internal bottom of the case,
lubricant stored in the case lubricates the gears while they
rotate.
In such a gear box, when the plurality of gears provided in the
gear box rotate, the lubricant is churned by the rotating gears
such that a lubrication portion expands to a portion not submerged
by the lubricant, and accordingly the gears can smoothly
rotate.
However, in the conventional gear box provided in the extra-large
sized excavator, the lubricant is churned by the rotating gears
such that the lubrication portion expands to the portion not
submerged by the lubricant, but other portions cannot be
lubricated.
Further, since a portion where the lubricant is not supplied is
relatively large in the conventional gear box, friction noise due
to a power transmission error of the gear is increased, and loud
load noise occurs due to friction between gears rotating at a
high-speed and air or due to vibration of a shaft system or
structural vibration.
The above information disclosed in this Background section is only
for enhancement of understanding of the background of the invention
and therefore it may contain information that does not form the
prior art that is already known in this country to a person of
ordinary skill in the art.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to provide a
device for lubrication and noise attenuation of a gear box for
driving a hydraulic pressure pump of an extra-large sized excavator
that can improve power transmission efficiency by enhancing
lubrication performance between gears and at the same time
remarkably attenuate noise.
A device for lubrication and noise attenuation of a gear box for
driving a hydraulic pressure pump of an extra-large sized excavator
according to an exemplary embodiment of the present invention
includes: a case housing where a lubricant is provided in the
bottom side thereof; a driving gear provided in the case housing
and rotating by a driving torque of an engine; first and second
driven gears engaged to lateral sides of the driving gear and
rotating in the case housing; and a third driven gear engaged to an
upper side of the driving gear and rotating, wherein the case
housing may include a lubrication plate provided in an inclined
manner from an upper side of the first driven gear to one side of
the third driven gear such that the lubricant drawn up by rotation
torque of the first driven gear is churned to an inner surface of
the lubrication plate and then dropped at the upper side of the
first driven gear and one side of the third driven gear for
lubrication.
The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator may further include an auxiliary lubrication plate
separately provided in an outer side of the third driven gear for
lubrication with the lubricant which is churned up along the inner
surface of the lubrication plate by the rotation torque of the
first and third driven gears, drawn up to the upper side of the
third driven gear, and then dropped to the upper surface of the
third driven gear.
The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator may further include a round-shaped auxiliary plate
separately provided at an outer side of the second driven gear.
The lubrication plate may include a flange portion formed by being
bent at lateral sides thereof, and the auxiliary lubrication plate
may include an auxiliary flange portion formed by being bent at
lateral sides thereof.
The lubrication plate may be gradually narrowed toward an upper
side from a lower side thereof.
An air path hole may be provided for air ventilation between the
lubrication plate and the auxiliary lubrication plate.
The auxiliary lubrication plate may be curved at a distance at an
outer side of the third driven gear and may include a straight-line
shaped plate formed in the shape of a straight line such that the
lubricant promptly flows down therethrough, is separated to an
outer side of the third driven gear and being bent, and of which an
end of the straight-line shape plate may protrude further toward
the driving gear than a connection bracket that connects the
auxiliary lubrication plate and the auxiliary plate.
The device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator may include connection ribs provided in other sides of
the lubrication plate, the auxiliary lubrication plate, and the
auxiliary plate to connect the lubrication plate, the auxiliary
lubrication plate, and the auxiliary plate to an inner surface of
the case housing. The installation rib may be formed in the shape
of a lattice or a zigzag.
According to the exemplary embodiment of the present invention, the
device for lubrication and noise attenuation of the gear box for
driving the hydraulic pressure pump of the extra-large sized
excavator can remarkably attenuate noise by enhancing a lubrication
friction rate between gears and at the same time improve power
transmission efficiency. Further, noise can be offset because a
resonance between the lubrication plate and the gear is small in
the gear box.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view and a separated perspective view of a
device for lubrication and noise attenuation of a gear box for
driving a hydraulic pressure pump of an extra-large sized excavator
according to an exemplary embodiment of the present invention.
FIG. 2 is a schematic perspective view of a primary part of the
device for lubrication and noise attenuation of the gear box for
driving the hydraulic pressure pump of the extra-large sized
excavator according to the exemplary embodiment of the present
invention.
FIG. 3 is a schematic separated perspective view of a primary part
of the device for lubrication and noise attenuation of the gear box
for driving the hydraulic pressure pump of the extra-large sized
excavator according to the exemplary embodiment of the present
invention.
FIG. 4 is a schematic view illustrating a state in which gears are
lubricated by the device for lubrication and noise attenuation of
the gear box for driving the hydraulic pressure pump of the
extra-large sized excavator according to the exemplary embodiment
of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The present invention will be described more fully hereinafter with
reference to the accompanying drawings, in which exemplary
embodiments of the invention are shown. As those skilled in the art
would realize, the described embodiments may be modified in various
different ways, all without departing from the spirit or scope of
the present invention.
The drawings and description are to be regarded as illustrative in
nature and not restrictive, and like reference numerals designate
like elements throughout the specification.
In addition, the size and thickness of each configuration shown in
the drawings are arbitrarily shown for better understanding and
ease of description, but the present invention is not limited
thereto.
In addition, unless explicitly described to the contrary, the word
"comprise" and variations such as "comprises" or "comprising" will
be understood to imply the inclusion of stated elements but not the
exclusion of any other elements.
As shown in FIG. 1 to FIG. 4, a device for lubricating and noise
attenuation of a gear box 100 for driving of a hydraulic pressure
pump of an extra-large sized excavator according to an exemplary
embodiment of the present invention includes the gear box 100. The
gear box 100 is formed of a case housing 110 wherein a lubricant
111 is provided in the bottom side thereof, a driving gear 120
provided in the case housing 110 and rotated by a driving torque of
an engine, first and second driven gears 130 and 140 rotating by
being engaged to lateral sides of the driving gear 120 in the case
housing 110, and a third driven gear 150 rotating by being engaged
to an upper side of the driving gear 120 such that driving torque
of the driving gear 120 is transmitted through the first, second,
and third driven gears 130, 140, and 150.
In such a gear box 100, a lubrication plate 131, an auxiliary
lubrication plate 151, and an auxiliary plate 141 are included. The
lubrication plate 131 is separately provided in the casing housing
110 in an inclined manner from an upper side of the first driven
gear 130 to one side of the third driven gear 150 such that the
lubricant 111 is drawn up by the rotation torque of the first
driven gear 130, churned to an inner surface thereof, and then
dropped down while lubricating the upper side of the first driven
gear 130 and the one side of the third driven gear 150.
The auxiliary lubrication plate 151 is separately provided in an
outer side of the third driven gear 150, and thus lubricant churned
up along the inner surface of the lubrication plate 131 by the
rotation torque of the first and third driven gears 130 and 150 is
moved up toward the upper side of the third driven gear 150 and
then dropped down to the upper surface of the third driven gear 150
for lubrication.
The auxiliary plate 141 is formed in a round shape and is
separately provided at an outer side of the second driven gear
140.
In the gear box having the above-stated configuration, the driving
gear 120 receives driving force of the engine and thus rotates
along the arrow direction (see FIG. 4), and then the first, second,
and third driven gears 130, 140, and 150 rotate along the arrow
direction.
Then, the lubricant 111 is churned up to the upper surface of the
first driven gear 130, and at the same time, while the lubricant
111 is churned up along the inner surface of the lubrication plate
131 by the rotation torque of the first driven gear 130, a part of
the lubricant 111 is partially dropped to the upper surface of the
first driven gear 130 and thus lubricates the upper surface of the
first driven gear 130, and another part of the lubricant 111 is
churned up along an inner side of the auxiliary lubrication plate
151 while being continuously churned up along the inner surface of
the lubrication plate 131, and is then dropped to the upper surface
of the third driven gear 150 such that the driving gear 120 and the
third driven gear 150 can be more effectively lubricated.
As described, in the device for lubrication and noise attenuation
of the gear box 100 for driving of the hydraulic pump of the
extra-large sized excavator according to the exemplary embodiment
of the present invention, a lubrication friction surface with the
first, second, and third driven gears 130, 140, and 150 that rotate
together with the driving gear 120 while being engaged along the
rotation of the driving gear 120 is expanded, and thus lubrication
performance and driving performance can be improved and at the same
time driving noise can be remarkably reduced.
The exemplary embodiment of the present invention will now be
described in detail, focusing on the gear box 100 formed of a
single input shaft and three output shafts. However, the present
invention is not limited thereto, and one output shaft may be
connected to one input shaft, or two or more output shafts may be
connected to one input shaft in the gear box 100.
In addition, the lubrication plate 131 is provided with a flange
portion 131a of which lateral sides are bent.
The auxiliary lubrication plate 151 is also provided with an
auxiliary flange portion 151a of which lateral sides are bent.
Further, the auxiliary plate 141 is provided with an auxiliary
flange portion 141a of which lateral sides are bent.
Thus, the flange portions 131a formed not only in an inner surface
but also in the lateral sides of the lubrication plate 131 let the
lubricant be collected to the upper surface side of the first
driven gear 130 and then dropped therefrom by preventing the
lubricant from scattering to the outer side by the rotation torque
of the first driven gear 130 such that lubrication rate can be
improved.
Likewise, the lubricant churned to the inner surface of the
auxiliary lubrication plate 151 and moved upward along the
auxiliary lubrication plate 151 by the driving torque of the first
driven gear 130 is prevented from being scattered to the outside by
the auxiliary flange portion 151a formed in the lateral sides of
the auxiliary lubrication plate 151 and thus collected to the upper
surface side of the third driven gear 150 and then dropped
therefrom, thereby improving lubrication rate.
In addition, a lower side width b (see FIG. 3) of the lubrication
plate 131 is wider than an upper side width a thereof.
That is, the lubrication plate 131 is gradually narrowed toward the
upper side a from the lower side b.
This is because the lower side of the lubrication plate 131 has
much more lubricant that is scattered upward by the rotation torque
of the first driven gear 130 than the upper side of the lubricant
plate 131 such that the lubricant in the lower side of the
lubrication plate 131 can be collected.
As described, according to the exemplary embodiment of the present
invention, lubricant scattered upward by the rotation torque of the
driving gear 120 provided in the case housing 110 of the gear box
100 is collected to the inner wall surface of the lubrication plate
131 and the auxiliary lubrication plate 151 provided in the case
housing 110 of the gear box 100 and then dropped back to the upper
side of the driven gear that rotates by being engaged to the
driving gear 120, such that a lubrication surface area can be
expanded, thereby improving lubrication efficiency and driving
efficiency, and at the same time reducing friction noise between
gears.
Here, the lubrication plate 131 and the auxiliary lubrication plate
151 serve as a path for a lubrication groove where the lubricant
scattered upward by high-speed rotation torque of the gear is
collected.
In addition, installation ribs 160 are provided in the other side
of each of the lubrication plate 131, the auxiliary lubrication
plate 151, and the auxiliary plate 141 for connection to an inner
surface of the case housing 110 of the gear box 100.
The installation ribs 160 can attenuate noise such as friction
noise or other structural vibration generated from inner sides of
the lubrication plate 131, the auxiliary lubrication plate 151, and
the auxiliary plate 141.
The installation ribs 160 is formed in the shape of lattices,
zigzags, and the like, thereby increasing a noise attenuation
effect.
Further, the installation rib 160 is preferably made of a resin
material or provided as a noise absorbing means such as a porous
plate so as to absorb noise.
In addition, an air path hole 132 is provided between the
lubrication plate 131 and the auxiliary lubrication plate 151 for
air ventilation to thereby preventing occurrence of an air pressure
difference in the gear box 100.
Accordingly, air pressure of the inside of the lubrication plate
131, the auxiliary lubrication plate 151, and the auxiliary plate
141 and air pressure of the outside of the lubrication plate 131,
the auxiliary lubrication plate 151, and the auxiliary plate 141
can be maintained equally in the case housing 110 of the gear box
100.
In addition, the auxiliary lubrication plate 151 and the auxiliary
plate 141 are connected by being fixed at their ends by a
connection bracket 142.
Further, the auxiliary lubrication plate 151 has a curved shape and
is distanced from the outside of the third driven gear 150, but one
end of the auxiliary lubrication plate 151 is provided as a
straight-line shaped plate 152 such that lubricant can quickly flow
down to the driving gear 120. The straight-line shaped plate 152
protrudes further toward the driving gear 120 than the connection
bracket 142.
Thus, the lubricant scattered to the inner side of the auxiliary
lubrication plate 151 is promptly dropped to the driving gear 120
for lubrication.
As described, in the device for lubrication and noise attenuation
of the gear box 100 that drives the hydraulic pressure pump of the
extra-large sized excavator, the gear box 100 is formed by
connecting one or plurality of output shafts to one input shaft,
and is provided with the lubrication plate that causes lubricant to
be churned up while being scattered to the upper side of the gear
provided in the gear box by rotation torque of the gear rotating at
a high speed and then dropped to the upper side of the gear for
lubrication so as to attenuate noise. Further ribs, which are sound
absorbing means such as a resin material or a porous plate, are
provided in an outer side of the lubrication plate to reduce
vibration, and accordingly, lubrication performance between gears
can be enhanced, thereby improving power transmission efficiency
and remarkably attenuating noise.
While this invention has been described in connection with what is
presently considered to be practical exemplary embodiments, it is
to be understood that the invention is not limited to the disclosed
embodiments, but, on the contrary, is intended to cover various
modifications and equivalent arrangements included within the
spirit and scope of the appended claims.
DESCRIPTION OF SYMBOLS
TABLE-US-00001 100: gear box 110: case housing 120: drive gear 130:
first driven gear 131: lubrication plate 131a: flange portion 132:
air path hole 140: second driven gear 141: auxiliary plate 141a:
auxiliary flange portion 142: connection plate 150: third driven
gear 151: auxiliary lubrication plate 151a: auxiliary flange
portion 152: straight-line shaped plate 160: installation rib
* * * * *